/Engine/Plugins/Experimental/Mutable/Source/MutableRuntime/Public/MuR/ExtensionDataStreamer.h
Start asynchronously loading the streamed constant data referenced by the givenExtensionData.
A handle that allows the caller to poll the load state. When the state is no longer Pending, the load is either complete or has failed.
[TSharedRef](API\Runtime\Core\Templates\TSharedRef)< const [FExtensionDataLoadHandle](API\Plugins\MutableRuntime\MuR\FExtensionDataLoadHandle) > StartLoad ( const [ExtensionDataPtrConst](API\Plugins\MutableRuntime\MuR\ExtensionDataPtrConst) & Data, [TArray](API\Runtime\Core\Containers\TArray)< [ExtensionDataPtrConst](API\Plugins\MutableRuntime\MuR\ExtensionDataPtrConst) > & OutUnloadedConstants )